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http://dx.doi.org/10.9720/kseg.2016.4.447

Experimental Study for determining the Basic Friction Angle of the Rock Joint  

Jang, Hyun-Sic (Department of Geophysics, Kangwon National University)
Jeong, Jong-Taek (Korea Institute of Civil Engineering and Building Technology)
Jang, Bo-An (Department of Geophysics, Kangwon National University)
Publication Information
The Journal of Engineering Geology / v.26, no.4, 2016 , pp. 447-460 More about this Journal
Abstract
Samples of Hangdeung granite and Berea sandstone containing sliding planes were prepared by saw-cutting and polishing using #100 or #600 grinding powders. Their basic friction angles were then measured directly in direct shear tests and triaxial compression tests, and also in tilt tests, which measure the angles indirectly. Although the angles measured by the direct methods were generally accurate, those measured along certain planes were greatly different from the others depending on the condition of the plane. The tilt tests yielded similar angles regardless of the sliding plane condition or the rock type; however, the error range was relatively wide. Sliding planes polished by the grinding powders yielded more accurate results than those cut by the saw and tested without polishing, as polishing ensured consistent conditions among all the planes. Sliding planes polished using #100 grinding powder yielded better results than polishing with #600 grinding powder. Therefore, the basic friction angles measured along the sliding planes polished using #100 grinding powder, as obtained in direct shear and triaxial compression tests, were the most reliable. The angle could also be measured satisfactorily by tilt testing along sliding planes polished with #100 grinding powder.
Keywords
Basic friction angle; direct shear test; triaxial compression test; tilt test; Hangdeung granite; Berea sandstone;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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